The Tcpdump Group git mirrors - libpcap/blob - pcap-libdlpi.c

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * This code contributed by Sagun Shakya (sagun.shakya@sun.com)
  22  */
  23 /*
  24  * Packet capture routines for DLPI using libdlpi under SunOS 5.11.
  25  */
  26
  27 #ifndef lint
  28 static const char rcsid[] _U_ =
  29         "@(#) $Header: /tcpdump/master/libpcap/pcap-libdlpi.c,v 1.6 2008-04-14 20:40:58 guy Exp $ (LBL)";
  30 #endif
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include <sys/types.h>
  37 #include <sys/time.h>
  38 #include <sys/bufmod.h>
  39 #include <sys/stream.h>
  40 #include <libdlpi.h>
  41 #include <errno.h>
  42 #include <memory.h>
  43 #include <stropts.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47
  48 #include "pcap-int.h"
  49 #include "dlpisubs.h"
  50
  51 /* Forwards. */
  52 static int pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *);
  53 static int pcap_inject_libdlpi(pcap_t *, const void *, size_t);
  54 static void pcap_close_libdlpi(pcap_t *);
  55 static void pcap_libdlpi_err(const char *, const char *, int, char *);
  56 static void pcap_cleanup_libdlpi(pcap_t *);
  57
  58 /*
  59  * list_interfaces() will list all the network links that are
  60  * available on a system.
  61  */
  62 static boolean_t list_interfaces(const char *, void *);
  63
  64 typedef struct linknamelist {
  65         char    linkname[DLPI_LINKNAME_MAX];
  66         struct linknamelist *lnl_next;
  67 } linknamelist_t;
  68
  69 typedef struct linkwalk {
  70         linknamelist_t  *lw_list;
  71         int             lw_err;
  72 } linkwalk_t;
  73
  74 /*
  75  * The caller of this function should free the memory allocated
  76  * for each linknamelist_t "entry" allocated.
  77  */
  78 static boolean_t
  79 list_interfaces(const char *linkname, void *arg)
  80 {
  81         linkwalk_t      *lwp = arg;
  82         linknamelist_t  *entry;
  83
  84         if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) {
  85                 lwp->lw_err = ENOMEM;
  86                 return (B_TRUE);
  87         }
  88         (void) strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX);
  89
  90         if (lwp->lw_list == NULL) {
  91                 lwp->lw_list = entry;
  92         } else {
  93                 entry->lnl_next = lwp->lw_list;
  94                 lwp->lw_list = entry;
  95         }
  96
  97         return (B_FALSE);
  98 }
  99
 100 static int
 101 pcap_activate_libdlpi(pcap_t *p)
 102 {
 103         int retv;
 104         dlpi_handle_t dh;
 105         dlpi_info_t dlinfo;
 106         int err = PCAP_ERROR;
 107
 108         /*
 109          * Enable Solaris raw and passive DLPI extensions;
 110          * dlpi_open() will not fail if the underlying link does not support
 111          * passive mode. See dlpi(7P) for details.
 112          */
 113         retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE);
 114         if (retv != DLPI_SUCCESS) {
 115                 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
 116                         err = PCAP_ERROR_NO_SUCH_DEVICE;
 117                 else if (retv == DL_SYSERR && errno == EACCES)
 118                         err = PCAP_ERROR_PERM_DENIED;
 119                 pcap_libdlpi_err(p->opt.source, "dlpi_open", retv,
 120                     p->errbuf);
 121                 return (err);
 122         }
 123         p->dlpi_hd = dh;
 124
 125         if (p->opt.rfmon) {
 126                 /*
 127                  * This device exists, but we don't support monitor mode
 128                  * any platforms that support DLPI.
 129                  */
 130                 err = PCAP_ERROR_RFMON_NOTSUP;
 131                 goto bad;
 132         }
 133
 134         /* Bind with DLPI_ANY_SAP. */
 135         if ((retv = dlpi_bind(p->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
 136                 pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf);
 137                 goto bad;
 138         }
 139
 140         /* Enable promiscuous mode. */
 141         if (p->opt.promisc) {
 142                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_PHYS);
 143                 if (retv != DLPI_SUCCESS) {
 144                         pcap_libdlpi_err(p->opt.source,
 145                             "dlpi_promisc(PHYSICAL)", retv, p->errbuf);
 146                         goto bad;
 147                 }
 148         } else {
 149                 /* Try to enable multicast. */
 150                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_MULTI);
 151                 if (retv != DLPI_SUCCESS) {
 152                         pcap_libdlpi_err(p->opt.source, "dlpi_promisc(MULTI)",
 153                             retv, p->errbuf);
 154                         goto bad;
 155                 }
 156         }
 157
 158         /* Try to enable SAP promiscuity. */
 159         retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_SAP);
 160         if (retv != DLPI_SUCCESS) {
 161                 if (p->opt.promisc) {
 162                         pcap_libdlpi_err(p->opt.source, "dlpi_promisc(SAP)",
 163                             retv, p->errbuf);
 164                         goto bad;
 165                 }
 166
 167                 /* Not fatal, since the DL_PROMISC_PHYS mode worked. */
 168                 fprintf(stderr, "WARNING: dlpi_promisc(SAP) failed on"
 169                     " %s:(%s)\n", p->opt.source, dlpi_strerror(retv));
 170         }
 171
 172         /* Determine link type.  */
 173         if ((retv = dlpi_info(p->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
 174                 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf);
 175                 goto bad;
 176         }
 177
 178         if (pcap_process_mactype(p, dlinfo.di_mactype) != 0)
 179                 goto bad;
 180
 181         p->fd = dlpi_fd(p->dlpi_hd);
 182
 183         /* Push and configure bufmod. */
 184         if (pcap_conf_bufmod(p, p->snapshot, p->md.timeout) != 0)
 185                 goto bad;
 186
 187         /*
 188          * Flush the read side.
 189          */
 190         if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
 191                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
 192                     pcap_strerror(errno));
 193                 goto bad;
 194         }
 195
 196         /* Allocate data buffer. */
 197         if (pcap_alloc_databuf(p) != 0)
 198                 goto bad;
 199
 200         /*
 201          * "p->fd" is a FD for a STREAMS device, so "select()" and
 202          * "poll()" should work on it.
 203          */
 204         p->selectable_fd = p->fd;
 205
 206         p->read_op = pcap_read_libdlpi;
 207         p->inject_op = pcap_inject_libdlpi;
 208         p->setfilter_op = install_bpf_program;  /* No kernel filtering */
 209         p->setdirection_op = NULL;      /* Not implemented */
 210         p->set_datalink_op = NULL;      /* Can't change data link type */
 211         p->getnonblock_op = pcap_getnonblock_fd;
 212         p->setnonblock_op = pcap_setnonblock_fd;
 213         p->stats_op = pcap_stats_dlpi;
 214         p->cleanup_op = pcap_cleanup_libdlpi;
 215
 216         return (0);
 217 bad:
 218         pcap_cleanup_libdlpi(p);
 219         return (err);
 220 }
 221
 222 /*
 223  * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
 224  * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
 225  * additional network links present in the system.
 226  */
 227 int
 228 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
 229 {
 230         int retv = 0;
 231
 232         linknamelist_t  *entry, *next;
 233         linkwalk_t      lw = {NULL, 0};
 234         int             save_errno;
 235
 236         /* dlpi_walk() for loopback will be added here. */
 237
 238         dlpi_walk(list_interfaces, &lw, 0);
 239
 240         if (lw.lw_err != 0) {
 241                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 242                     "dlpi_walk: %s", pcap_strerror(lw.lw_err));
 243                 retv = -1;
 244                 goto done;
 245         }
 246
 247         /* Add linkname if it does not exist on the list. */
 248         for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
 249                 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
 250                         retv = -1;
 251         }
 252 done:
 253         save_errno = errno;
 254         for (entry = lw.lw_list; entry != NULL; entry = next) {
 255                 next = entry->lnl_next;
 256                 free(entry);
 257         }
 258         errno = save_errno;
 259
 260         return (retv);
 261 }
 262
 263 /*
 264  * Read data received on DLPI handle. Returns -2 if told to terminate, else
 265  * returns the number of packets read.
 266  */
 267 static int
 268 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
 269 {
 270         int len;
 271         u_char *bufp;
 272         size_t msglen;
 273         int retv;
 274
 275         len = p->cc;
 276         if (len != 0) {
 277                 bufp = p->bp;
 278                 goto process_pkts;
 279         }
 280         do {
 281                 /* Has "pcap_breakloop()" been called? */
 282                 if (p->break_loop) {
 283                         /*
 284                          * Yes - clear the flag that indicates that it has,
 285                          * and return -2 to indicate that we were told to
 286                          * break out of the loop.
 287                          */
 288                         p->break_loop = 0;
 289                         return (-2);
 290                 }
 291
 292                 msglen = p->bufsize;
 293                 bufp = p->buffer + p->offset;
 294
 295                 retv = dlpi_recv(p->dlpi_hd, NULL, NULL, bufp,
 296                     &msglen, -1, NULL);
 297                 if (retv != DLPI_SUCCESS) {
 298                         /*
 299                          * This is most likely a call to terminate out of the
 300                          * loop. So, do not return an error message, instead
 301                          * check if "pcap_breakloop()" has been called above.
 302                          */
 303                         if (retv == DL_SYSERR && errno == EINTR) {
 304                                 len = 0;
 305                                 continue;
 306                         }
 307                         pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd),
 308                             "dlpi_recv", retv, p->errbuf);
 309                         return (-1);
 310                 }
 311                 len = msglen;
 312         } while (len == 0);
 313
 314 process_pkts:
 315         return (pcap_process_pkts(p, callback, user, count, bufp, len));
 316 }
 317
 318 static int
 319 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
 320 {
 321         int retv;
 322
 323         retv = dlpi_send(p->dlpi_hd, NULL, 0, buf, size, NULL);
 324         if (retv != DLPI_SUCCESS) {
 325                 pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd), "dlpi_send", retv,
 326                     p->errbuf);
 327                 return (-1);
 328         }
 329         /*
 330          * dlpi_send(3DLPI) does not provide a way to return the number of
 331          * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
 332          * returned we are assuming 'size' bytes were sent.
 333          */
 334         return (size);
 335 }
 336
 337 /*
 338  * Close dlpi handle.
 339  */
 340 static void
 341 pcap_cleanup_libdlpi(pcap_t *p)
 342 {
 343         if (p->dlpi_hd != NULL) {
 344                 dlpi_close(p->dlpi_hd);
 345                 p->dlpi_hd = NULL;
 346                 p->fd = -1;
 347         }
 348         pcap_cleanup_live_common(p);
 349 }
 350
 351 /*
 352  * Write error message to buffer.
 353  */
 354 static void
 355 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
 356 {
 357         snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
 358             func, linkname, dlpi_strerror(err));
 359 }
 360
 361 pcap_t *
 362 pcap_create(const char *device, char *ebuf)
 363 {
 364         pcap_t *p;
 365
 366         p = pcap_create_common(device, ebuf);
 367         if (p == NULL)
 368                 return (NULL);
 369
 370         p->activate_op = pcap_activate_libdlpi;
 371         return (p);
 372 }